R.J. Von Gutfeld, B. Welber, et al.
IEEE JQE
Results from experiments in which the ultraviolet pulses from a nitrogen laser are used to obtain laser action from organic dyes are described. The dyes include three in the xanthene group (rhodamine 6G, B, and sodium fluorescein) and two coumarins, 7-diethylamino-4-methylcoumarin and 7-N-dimethylamino-4, 6-dimethylcoumarin) in ethanol solvent. With these dyes, laser power is available over the entire visible range from 4200 to 6300 Å when used with a rotatabie diffraction grating. The range of tunability of one of the dyes was extended to ∼ 1000 Å by appropriate acidification. The spectral halfwidth of the light varied between 7 and 15 Å over the range of tunability. Maximum repetition rates of 100 pps were obtained. Maximum power efficiency of ∼ 25% was found for rhodamine 6G. Overall output pulse shapes were found to be in agreement with the theory of Sorokin et al. Output pulse widths varied from ∼ 1 to 7 nsec. Other dyes which we have found to lase by this method of excitation include acridone, chloro-aluminium pthalocyanine and 4-methylumbelliferone. However, these dyes will not be discussed further in the text. © 1970 Chapman and Hall Ltd.
R.J. Von Gutfeld, B. Welber, et al.
IEEE JQE
R.J. Von Gutfeld, D.R. Vigliotti, et al.
Applied Physics Letters
P.P. Sorokin, J.R. Lankard
IEEE JQE
R.J. Von Gutfeld, R.T. Hodgson
Applied Physics Letters